He claimed he got it from an engram upon killing Draksis. Does it seem legitimate to you that we haven't seen a single other person pop up with it since then? Something's fishy there, my guess would be that he found something, possibly in a daily(someone on his thread suggested The Coming War and it does look like a cabal piece with a dodge reminiscent of their jump jets), and hasn't told anyone. This misdirection is his way of basking in attention and being able to show it off while preserving his snowflake factor.